Fastening for abrasive bodies having a porcelain base.



( 1. JUNG.

FASTENING FOR AIBRASIVJZI" BODIES HAVING A PORCELAIN BASE.

APPLICATION FILED AUG. 12,1908.

Patented May 4, 1909.

'l nveniun 8 e M W CARL JUNG, or BERBIN, GERMANY.

FASTENING" FOR A BRASIVE BODIES HAVING A PORCELAIN BASE.

Specification of Letters Patent.

Patented May 4, 1909.

Application filed August 12, 1908. Serial No. 448,265.

To all whom it may concern:

Be it known that I, CARL J UNG, rofessor of dental surgery, citizen of the Germany, and resident of 17 Tauenzienstrasse, Berlin, Germany, have made certain new and useful Improvements in a Fastening for Abrasive Bodies having a Porcelain Base, of which the following is a specification.

In using small grinding wheels or disks and stones of carborundum or other similar abrasive materials which are bound in a porcelain-like base and hardened in a furnace, the fastening of the Wheels or stones in the holder b cement, such as shellac, sulfur or phospfiate cement, is ver defective, as the cement cannot join itse f to the porcelain mass sufficiently intimately.

The object of the resent invention is to remove this defect. his is done in the matter illustrated upon the drawing by providing a sleeve of metal a to which enamel can adhere and which is fixed into a corresponding hole in the center of the abrasive body b mpire of by hardening in the furnace. The one end of the handle 0 can then be soldered by tin into the sleeve. By this arrangement the abrasive body is so securely fixed to the handle that any loosening by any strain during working is impossible.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be per formed, I declare that what I claim is:

The process of securing a socketed abrasive body to a handle which consists in inserting a metal sleeve in the socket of said abrasive body and applying heat thereto to unite the sleeve therein, and in subsequently soldering a s indle in said sleeve, substan tially as and or the pur ose set forth.

In testimony whereof T have hereunto set my hand in presence of two subscribing Witnesses.

CARL JUN G. Witnesses WOLDEMAR HAUPT, HENRY HASPER; 

